<template>
  <!-- v-if="topCategory" 可以避免访问对象子属性报错 -->
  <div class="top-category" v-if="topCategory">
    <div class="container">
      <!-- 面包屑 -->
      <XtxBread>
        <!-- 注释节点 -->
        <!-- 注释节点 -->
        <!-- 注释节点 -->
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <Transition name="fade-right" mode="out-in">
          <XtxBreadItem :key="topCategory.name">{{ topCategory.name }}</XtxBreadItem>
        </Transition>
      </XtxBread>
      <!-- 轮播图 -->
      <XtxCarousel :sliders="sliders" style="height:500px" />
      <!-- 所有二级分类 -->
      <div class="sub-list">
        <h3>全部分类</h3>
        <ul>
          <li v-for="item in topCategory.children" :key="item.id">
            <RouterLink :to="`/category/sub/${item.id}`">
              <img :src="item.picture" />
              <p>{{ item.name }}</p>
            </RouterLink>
          </li>
        </ul>
      </div>
      <!-- 不同分类商品 -->
      <div class="ref-goods" v-for="item in topCategory.children" :key="item.id">
        <div class="head">
          <h3>- {{ item.name }} -</h3>
          <p class="tag">{{ item.tag }}</p>
          <XtxMore />
        </div>
        <div class="body">
          <GoodsItem v-for="goods in item.goods" :key="goods.id" :goods="goods" />
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { findTopCategory } from '@/api/category'
import { useRoute } from 'vue-router'
import { ref, watch } from 'vue'
import { findBanner } from '@/api/home'
import GoodsItem from './components/goods-item.vue'
export default {
  components: { GoodsItem },
  name: 'TopCategory',
  // 🔔 setup 生命周期钩子只会执行一次
  setup () {
    // Vue2 获取动态路由参数
    // this.$route.params
    // 🔔Vue3 获取动态路由参数，使用 useRoute 组合 api 获取
    const route = useRoute()
    // console.log(route.params)
    const topCategory = ref(null)
    // 🔔 watch 监听id参数的变化，当id发生变化的时候，需要重新发送请求
    watch(() => route.params.id, (id) => {
      // console.log(id, route.path, `/category/${id}`)
      // 💥 如果不是一级分类页，就return 退出，不发送请求
      if (`/category/${id}` !== route.path) return
      // 根据一级分类 id 获取数据
      findTopCategory(route.params.id).then(({ result }) => {
      // console.log(result)
        topCategory.value = result
      })
    }, { immediate: true })

    // 获取轮播图数据
    const sliders = ref([])
    findBanner(2).then(({ result }) => {
      sliders.value = result
    })

    return { topCategory, sliders }
  }
}
</script>

<style scoped lang="less">
.top-category {
  h3 {
    font-size: 28px;
    color: #666;
    font-weight: normal;
    text-align: center;
    line-height: 100px;
  }
  .sub-list {
    margin-top: 20px;
    background-color: #fff;
    ul {
      display: flex;
      padding: 0 32px;
      flex-wrap: wrap;
      li {
        width: 168px;
        height: 160px;
        a {
          text-align: center;
          display: block;
          font-size: 16px;
          img {
            width: 100px;
            height: 100px;
          }
          p {
            line-height: 40px;
          }
          &:hover {
            color: @xtxColor;
          }
        }
      }
    }
  }
  .ref-goods {
    background-color: #fff;
    margin-top: 20px;
    position: relative;
    .head {
      .xtx-more {
        position: absolute;
        top: 20px;
        right: 20px;
      }
      .tag {
        text-align: center;
        color: #999;
        font-size: 20px;
        position: relative;
        top: -20px;
      }
    }
    .body {
      display: flex;
      justify-content: flex-start;
      flex-wrap: wrap;
      padding: 0 65px 30px;
    }
  }
}
</style>
